| 北京市不同土地利用方式下土壤铅的积累 |
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| 引用本文： | 郑袁明,陈同斌,陈煌,郑国砥,罗金发.北京市不同土地利用方式下土壤铅的积累[J].地理学报,2005,60(5):791-797. |
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| 作者姓名： | 郑袁明 陈同斌 陈煌 郑国砥 罗金发 |
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| 作者单位： | 中国科学院地理科学与资源研究所环境修复中心,北京,100101;中国科学院地理科学与资源研究所环境修复中心,北京,100101;中国科学院地理科学与资源研究所环境修复中心,北京,100101;中国科学院地理科学与资源研究所环境修复中心,北京,100101;中国科学院地理科学与资源研究所环境修复中心,北京,100101 |
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| 基金项目： | 国家自然科学基金;北京市自然科学基金 |
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| 摘 要： | 通过对北京市菜地、稻田、果园、绿化地、麦地以及自然土壤等土地利用类型600个土壤的监测分析,探讨了不同土地利用方式对土壤铅积累的影响。研究结果表明,全部土壤样品中铅浓度的几何平均值为26.6mg/kg,显著高于北京市土壤背景值(24.6mg/kg),呈现出明显的积累趋势。不同土地利用方式对土壤铅积累有明显影响,其中绿化地土壤的平均铅浓度最高,依次为果园、菜地、稻田、自然土壤,麦地平均铅浓度最低,绿化地土壤的铅浓度要显著高于除果园外的其他土地利用类型。果园土壤的铅浓度同样与其他大多数土地利用类型的土壤有较显著的差别。以基线值为标准,除自然土壤外,其他5种土地利用类型下均有不同程度的样品超标:果园超标率最高(21.4%),其他分别为绿化地18.2%,菜地11.1%,稻田8.3%,麦地5.2%;样品总体的超标率为7.2%。从行政区域来看,城区土壤的铅浓度高于近郊区,近郊区要明显高于远郊区土壤,超标样点主要分布在昌平、朝阳、大兴、丰台、海淀、石景山区等城区或近郊区,因而土壤铅浓度有从城市中心区向外逐渐降低的趋势。在本研究中,大气沉降、垃圾填埋以及农药施用等人类活动可能是影响不同土地利用类型下土壤铅积累浓度的重要原因。
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| 关 键 词： | 土地利用 土壤 重金属 铅 北京 垃圾填埋 |
| 收稿时间： | 2005-02-19 |
| 修稿时间： | 2005-06-27 |
Lead Accumulation in Soils under Different Land Use Types in Beijing City |
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| ZHENG Yuanming,CHEN Tongbin,CHEN Huang,ZHENG Guodi,LUO Jinfa.Lead Accumulation in Soils under Different Land Use Types in Beijing City[J].Acta Geographica Sinica,2005,60(5):791-797. |
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| Authors: | ZHENG Yuanming CHEN Tongbin CHEN Huang ZHENG Guodi LUO Jinfa |
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| Institution: | Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China |
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| Abstract: | To obtain an overview of land use effects on the accumulation of Pb in the soil,600 samples were collected from Beijing. The results showed that the geometric mean of allsoil samples was 26.6 mg/kg, significantly higher than the background concentration ofBeijing soil (24.6 mg/kg). Based on the assessment compared with background concentration,increasing of Pb was found to be the highest in greenbelt and orchard and to a somewhatlesser extent in vegetable field and paddy field, whereas anthropogenic input seemed to be lessimportant in natural soil. And the concentrations of Pb in greenbelt and orchard weresignificantly higher than those in other land use types. Using baseline as the criterion, theorchard showed the highest ratio beyond the limit for 21.4% . Corresponding values ofgreenbelt, vegetable field, paddy field, and cornfield were 18.2%, 11.1%, 8.3% and 5.2%,respectively and 7.2% for the total samples. The samples over the limit were mainlydistributed in districts of Changping, Chaoyang, Daxing, Fengtai, Haidian and Shijingshan.The six districts were attributed with high ratios beyond the baseline limit for soil samples.Therefore, the concentrations of Pb in the soils declined gradually with the increment of thedistance of the soils from the city zone. Through present investigation, it was found that theimpacts of human activities of atmospheric precipitation, landfill of waste and fertilizerapplication are probably the important reasons for Pb concentrations under different land-usetypes. |
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| Keywords: | land use type soil heavy metal Pb Beijing land fill |
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